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Apologies for multiple postings! We invite contributions to the session T183 of the upcoming 125th Anniversary GSA Annual meeting, which takes place in Denver, October 27-30, 2013 Session T183: Rates and Thermomechanical Characteristics of Processes Controlling the Rheologic Evolution of Arc Systems Convenors: Stacia Gordon, Bob Miller Continental magmatic arc systems are major components of orogenic belts (e.g., Andes, South America; Fiordland, New Zealand); thus, understanding how these arc systems evolve through time is critical for our overall understanding of plate-margin orogenesis. There are a variety of different factors that may control the rheologic evolution of arc system: e.g., thrust imbrication of back or fore arc material; the overall amount of sediment versus magmatic components within the arc; and the nature of the subducting plate. We seek a variety of contributions that investigate the different processes controlling the rheology of the arc system. Moreover, it is also critical to understand the rates at which these processes are occurring to understanding the transition from a growing, thickening arc system to the point where the orogen will undergo collapse. Invited Speakers: Mark Behn (Woods Hole), Keith Klepeis (U of Vermont), and Alan Chapman (U of Arizona) The abstract deadline is 6th August 2013 at 23:59 (Pacific Time) We look forward to seeing you in Denver! Stacia and Bob